Abstract: Aspects of the present disclosure include methods, apparatus, and systems for deactivating an AM tag including receiving a deactivation signal via a first inductive coil, storing electrical charges generated from the deactivation signal in a capacitor, and discharging the electrical charges through a second inductive coil, wherein: a first bias strip in the demagnetized state and a second bias strip cause a resonator to vibrate at a first resonant frequency corresponding to an activated state of the AM tag, the discharging magnetizes the first bias strip from a demagnetized state to a magnetized state, and the first bias strip in the magnetized state and the second bias strip cause the resonator to vibrate at a second resonant frequency different than the first resonant frequency, wherein the resonator vibrating at the second resonant frequency corresponds to a deactivated state of the AM tag.

Abstract: Aspects of the present disclosure include methods, apparatus, and systems for deactivating an AM tag including receiving a deactivation signal via a first inductive coil, storing electrical charges generated from the deactivation signal in a capacitor, and discharging the electrical charges through a second inductive coil, wherein: a first bias strip in the demagnetized state and a second bias strip cause a resonator to vibrate at a first resonant frequency corresponding to an activated state of the AM tag, the discharging magnetizes the first bias strip from a demagnetized state to a magnetized state, and the first bias strip in the magnetized state and the second bias strip cause the resonator to vibrate at a second resonant frequency different than the first resonant frequency, wherein the resonator vibrating at the second resonant frequency corresponds to a deactivated state of the AM tag.

Abstract: A damping control system disposed at a location of an antenna resonant circuit detects an exciter signal produced by a remotely located EAS transmitter. The damping control system generates a switch control signal in response to the detection of an EAS exciter signal burst. The switch control signal is used to reduce a Q factor of the antenna resonant circuit by selectively controlling at least one switching element connected to the antenna resonant circuit. The damping control system controls a timing of the switch control signal so as to reduce the Q factor at a predetermined time selected to reduce ringing at a trailing edge of each periodic burst.

Abstract: Systems (100) and methods (900) for detecting the presence of a security tag. The methods involve performing operations by a master pedestal of an EAS system to determine a first Tx/Rx scheme to be used during a first iteration of an EAS tag detection process based on (A) a first total number of time windows randomly selected from a plurality of total number of time windows in which an EAS exciter signal should be transmitted from at least one pedestal, and (B) first time windows randomly selected from a plurality of time windows in which the EAS exciter signal can be sent during the EAS tag detection process. Information specifying the first Tx/Rx scheme is communicated from the master pedestal to at least one slave pedestal. Transmit and receive operations are performed by the master and slave pedestals in accordance with the first Tx/Rx scheme.

Abstract: Electronic article surveillance system includes an antenna system comprised of two or more of resonant circuits. Each resonant circuit includes an exciter coil having at least one wire turn aligned on a common coil axis. A transmitter is coupled to the antenna system and is arranged to generate an antenna system composite exciter signal. The composite exciter signal is comprised of a plurality of co-exciter signals having the same predetermined frequency. The composite exciter signal is capable of exciting an EAS security tag when applied to the antenna system. The transmitter has two or more transmitter output ports, each independently coupled to one of the plurality of resonant circuits. Each of the plurality of co-exciter signals is respectively provided separately from a transmitter output port to one of the of resonant circuits.

Abstract: A damping control system disposed at a location of an antenna resonant circuit detects an exciter signal produced by a remotely located EAS transmitter. The damping control system generates a switch control signal in response to the detection of an EAS exciter signal burst. The switch control signal is used to reduce a Q factor of the antenna resonant circuit by selectively controlling at least one switching element connected to the antenna resonant circuit. The damping control system controls a timing of the switch control signal so as to reduce the Q factor at a predetermined time selected to reduce ringing at a trailing edge of each periodic burst.

Abstract: Electronic article surveillance system includes an antenna system comprised of two or more of resonant circuits. Each resonant circuit includes an exciter coil having at least one wire turn aligned on a common coil axis. A transmitter is coupled to the antenna system and is arranged to generate an antenna system composite exciter signal. The composite exciter signal is comprised of a plurality of co-exciter signals having the same predetermined frequency. The composite exciter signal is capable of exciting an EAS security tag when applied to the antenna system. The transmitter has two or more transmitter output ports, each independently coupled to one of the plurality of resonant circuits. Each of the plurality of co-exciter signals is respectively provided separately from a transmitter output port to one of the of resonant circuits.